
//页面滚动位置保持
/*调用方法:修改Body 的onload,onunload 就可以了

<body onload="document.body.scrollTop=GetCookie('posy')"
		onunload="SetCookie('posy',document.body.scrollTop)">

*/
function GetCookie (name) 
{
   var arg = name + "=";
   var alen = arg.length;
   var clen = document.cookie.length;
   var i = 0;
   while (i < clen)
   {
       var j = i + alen;
       if (document.cookie.substring(i, j) == arg)
       return getCookieVal (j);
       i = document.cookie.indexOf(" ", i) + 1;
       if (i == 0) break; 
   }
 return null;
}

function getCookieVal (offset) 
{
   var endstr = document.cookie.indexOf (";", offset);
   if (endstr == -1)
     endstr = document.cookie.length;
     return unescape(document.cookie.substring(offset, endstr));
   }
function SetCookie (name, value) 
   {
     document.cookie = name + "=" + escape (value);
   }
   //****************************************